Delirium is an abrupt change in the brain that causes mental confusion and emotional disruption. It makes it difficult to think, remember, sleep, pay attention, and more. You might experience the condition during alcohol withdrawal, after surgery,...

Seizures are changes in the brain's electrical activity. This change can cause dramatic, noticeable symptoms or it may not cause any symptoms. The symptoms of a severe seizure include violent shaking and a loss of control. However, mild seizures c...

An abnormal heart rhythm is when your heart beats too fast, slow, or irregularly. This is also called an arrhythmia. Within the heart is a complex system of valves, nodes, and chambers that control how and when the blood is pumped.